There are two ways to create a horizontal opt-in bar using PopupAlly Pro. The first is by creating a simple horizontal opt-in.
The second method is to use a Fluid Template. Watch these videos to learn how to create the horizontal opt-in that you wish to use:
Tutorial 1: A Simple Horizontal Opt-In
This video tutorial shows you how to create a horizontal opt-in bar.
Tutorial 2: A Horizontal Opt-In Created with a Fluid Template
This video tutorial shows you how to create a horizontal opt-in bar than spans the entire width of your website.